Uikitty is a fast open-source framework for building Drupal 8 sites.
UIkit gives you a comprehensive collection of HTML, CSS, and JS components
which is simple to use, easy to customize and extendable.
A collection of small, responsive components using consistent and conflict-free naming conventions.
UIkit's very basic style can be extended with themes and is easy to customize to create your own look.
With the mobile-first approach UIkit provides a consistent experience from phones and tablets to desktops.